Unique Name: The identification name used by Joomla! to identify this menu. It must be unique. Spaces are not recommended. This displays under module parameters when editing the module.

Title: A proper title for the menu. This is used to identify the menu the Menu Manager in the backend.

Description: A description of the menu, useful for your own reference.

Module Title: The title that will be given to the mod_mainmenu module in the Module Manager. This will be the published title or name which displays in the front-end (if you tick yes to "show title" in the Module Details when editing the module via the Module Manager). This will only be displayed when creating a new menu. However it can be edited in the Module Manager in the back-end after the module has been created. If left blank, a module will not be created and you will not be able to show this menu in the Front-end.